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It's not only the cd that counts, but also the (archive)

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Posted by Paul on May 19, 2001 at 07:53:02:

In Reply to: oops road&track was wrong/BMW brochure .33cd e46M3 posted by Huzurdd on May 18, 2001 at 19:54:50:

frontal area, as a car with lower cd but greater frontal area may have more drag than a car with slightly greater cd but lower frontal area.

So if anyone knows the frontal area of both cars they can work it out by using

Drag = 0.5*1.226*velocity^2*frontal area*cd

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